What is the difference between the LI190SB-L and the LI200X-L?

The LI190SB-L measures photosynthetically active radiation (PAR), a spectral range of solar radiation from 400 to 700 nm.  This is the energy that plants use during photosynthesis.  Measurements with the LI190SB-L are reported as photosynthetic photon flux density (PPFD). 

The LI200X-L measures total solar radiation from 400 to 1100 nm. Measurements are usually reported in units of W/m2.  

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